Traction-wheel



Adetail view in vertical section.

UNITED STATES;

PATENT OFFICE;

EDWARD H. ASHGROFT, OFA'LYNN, MASSACHUSETTS:

" TRAcTloN-WHEEL. r .Y

SPECIFICATION forming part of Letters Patent NQ.`38] .,202,;datd Apri1l`1'7r,1888. y Application tiled November 15, 1887. `Serial No. 255,187. (No modelJ i To all whonft it may concerne:

. Beitknown that I, EDWARD H. AsHcRoF'r,

of Lynn, in the county of Essex and State of Massachusetts, acitizen of the United States, have invented a new and useful Improvement in Traction-(Wheels, of which the following is a full, clear, and exact description, reference being had t0 the accompanying drawings, forming a part of this specification, in explaining rits nature. Y

ing a required plane surface or facet upon their peripheries. g y v In the drawings, Figure lfrepresents aportion of adriving-Wheelof a locomotive having the features of my invention. Fig. 2 is a View in end eleva-tion thereof. Fig. 3 is a de; tail view in section, enlarged, ofa portion of a wheel, and also of its rail. Fig. 4 is' also a Fig. L5 is a detail view inelevation.

` f Referring to the drawings, A represents the4 i wheel, c lits tire, and af the tread orfperiphery ofthe. wheel and tire. y'The tread of the wheel 3o is formed or provided with shallowrecesses or cavities as. These recesses may extend from a tread which is cylindrical in shape or a'tread Y which Yis polygonal in shape. Therecesses may be oval in shape,xas represented in FigS.`

2 and 4, circular in shape, as represented in Fig. 5, and they maybe arranged la number of them upon'the same line, or upon a. skewline, as represented in the drawings.

By Vproviding the/#treads of the tractionor 4o driving wheelswith. Vcavities ythe traction or#y holdingl power ofthe Wheels and l railpwillfbe very considerably increased. i Y Having thus fully described my invention, I

. claimandY desire to secure by-LettersPatent i5 of the United'Statesi The locomotive or car driving or traction wheels having shallow recesses orvcavities formed in their treads or peripheries, and

for Vthe purposes specified.

EDWARD H. ASHCROFT..

Witnesses: e Y

F. F. RAYMOND, 2d, I J. M. DoLAN. 

